Apparatus for working metal



June 8, 1954 K, B; KAI-SER 2,680,391

APPARATUS FOR WORKING: METAL Filed Aug. 17, 1951 10 Sheets-Sheet 1 June8, 1954 K. B. KAISER 2,680,391

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APPARATUS FOR WORKING METAL Filed Aug. 17, 1951 10 Sheets-Sheet 9IMvsIa-rov=- adcur I o 1 PW/Wr TTO'QNEY June 8, 1954 K. B. KAISERAPPARATUS FOR WORKING METAL 10 Sheets-Sheet 10 Filed Aug. 17, 1951 Y5@Ceul Jae;- 647 r-ac amsw Patented June 8, 1954 UNITED STATES PATENTOFFI CE APPARATUS FOR 'WOR'KING'META'L Karl JB. Kaiser, Rockford, 111.,.assig-nor to The rI-ngersollMilling Machine Company, Rockford, 111,,.arcorporationof 'Illinois Application August 1 7, 1951, Serial No.242,261

8-Glaims.

This invention relates to apparatus :for working the metal of elongatedbars such as tubes to reduce the cross section thereof andcorrespondingly lengthen the :bars.

Heretofore, such rolling out of "the metal of the bars has beenefiected-"by cams or rolls .having vacant sectors which when disposedopposite the tube or bar .zpermit periodic :endwise feedin by which anewlength of .Joar is presented to the rolls. In the iso-icalled pilgermill, the rolls are vjournaled-on =:a stationary frame which isadvantageous in view of the rugged mounting required butdisadvantageousin that the rolls are idle for half ofeachzrevolutionduring which the bar is fed forwardly. ;In the so-calledtube reducing process, :"greater :production :is achieved by mountingthe rolls on 'a carriage which is reciprocated back-and :forth :along:the stationary work bar so that the rolls may-work the metal in both oftheir oscillating .=mov.ements. :This method requires a costly machinestructure for guiding the roll carriage, necessitates reciprocation ofaheavy mass, iandcomplicates the procedure of changing the rolls.

The primary object of "the :present invention .is to providea barreducing apparatus which nombines all of the advantages and overcomesthe disadvantages of the two Lmeth'od's above .referred to.

Another object is to provide :a :novel mechanism for reciprocating thework bar, ioscillating the rolls, :and .intermittently feeding the workin synchronism while permitting the rolls .to he mounted in a stationary.frame.

A more detailed object LiS'ZtO reciprocate the work back and forth .andat the same time 2170 utilize the work 'reciprocatinns as ea source ofpower for oscillating the working rolls whack-and forth.

The invention also aims to achieve the foregoing object throughthefimounting of'the intermittent work feeding mechanism :onthereciproeating work carriage.

Other objects and-advantagesof the invention will become apparent Ffromthe ffollowing detailed description taken in connection with theaccompanying drawings, .in which Figure 1 is a fragmentary :sideelevational view of a metal workingmachinemodyingtthe novel features ofthe present invention.

Fig. 2 is a fragmentary sectional view taken along the line ;2-:2 ofil'igsl.

Fig. 3 is a fragmentary across section through the rolling dies andthe-workpiece.

Fig. 4 is a iragmentary sectional view taken .2 tional views takenrespectively along the lines 5--:5, 6-6 and l-:'| o-f L'E'ig. 4.

Figs. 18., :9 and .11) :are zfragmentary cross-sectionalviews takenalong the lines 18-8, 9-3 and I'D-1:0 of Fig. '1.

.Fig. 11 is .a fragmentary longitudinal sectional view taken along theline 'H-:l..l of Fig. :9.

vFig. 121s .assectional view taken along the line l2-':I'.-2 of :Fig.11.

Figs. I3 :and 14 areschematicplan views showing .the parts :at the rightand left .hand -ends of the machine shown inFig. .1.

Figs. 7 15 through 18 are schematic views :illustrating the action:of'the work feeding mechanism.

.Fig. 119 ?is airagmentary=sectional view taken along the line l9l9 ofFig. 9.

.'Fi'g.:-20;is a fragmentarysection :taken along the linen-2B of Rig-16.

'Whi-le :the invention .is "susceptible of various modifications .and.alternative constructions, I have shown in "the drawings and willherein .describe in detail the preferred embodiment. It is to beunderstood, however, that 1. do not intend :to limit theinvention bysuch=disolosure, zbut aim to cover all modifications and alternativeconstructions falling within the spirit and :scope of the :invention .asexpressed in the appended claims.

f'I he invention is shown :for purposes of :illustration incorporated.in :a .machine .ifor reducing the diameter, both inside vand'outside,:of a metal tube J!) .:by the .cold .iforging action thereon ao'fsemicircular rolls 4| journ'aled in a .stationary frame 12 -at one end:of a "be'di'iS which carries the power iiriven mechanisms forireciprocating the work tube, periodicallyieedingdzhesame-endwiseinshort increments, turning the :tubestep by :step, iand i oscillatingthe rolls .1 i.

In general, ithe trailing mend iportionl'o'f the tube is fastenedthrough a gripper 1 5 and .an :intermittently :acting feed mechanism H5'(Fig. 4) to a carriage 'l il islidable bao'k :and forth along the bedto Lreciproc'atefthe work tubeand correspondingly oscillate the rolls t:back and for th abetween the l-imi t positionsshown in @Figs. 11:5 rand16. :After the active roll surfaces a'have passed out -of engagementwith the workz at the end :of the retraction of -the latter, the l feedmechanism is actuated to-advance the work -a -shorlt distance relativeto thecarriage topresent-5a newponti'on of the tube to :the rolls.-Also, =at-each end of the carriage stroke, the tribe is turned througha partial revolution-to present any Ifiash 'forme'dat the junction*ofthe two roll surfaces to-lce rolled away'in the next stroke.

-A'mandrel F8 disposedwithm the tube-between the rolls I l projectsoutwardly through the trailing end of the tube H! where it is detachablyfastened to the carriage H and held against axial movement relativethereto. Where it is desired to reduce the internal as well as theexternal work diameter, the mandrel is tapered as indicated at l9 (Fig.3).

The rolls I l are grooved as shown in Fig. 10 to straddle oppositehalves of the work tube and each axial section has a gradual cam rise 28extending over somewhat more than a half revolution so as to leave avacant sector on one side of the roll permitting endwise advance of thework tube when the rolls are positioned as shown in Figs. and 18. Therolls are fast on suitable shafts 2 l journaled in bearings supported inthe side walls of the frame I2. Preferably, each roll is backed by aroll 22 also supported in the frame l2.

The carriage H by which the work is reciprocated back and forth isslidable in heavy guides 23 (Fig. 2) formed along opposite sides and onthe top of the bed i3. Power for reciprocating the slide is derived froma motor 24 (Fig. 13) mounted in the bed and, through speed reductiongears 25, drives two gears 26 which carry crank pins 21 joined byconnecting rods 28 to an oscillating arm 29 pivoted at 3%! (Fig. l) onthe bed iii. The latter is of substantial width and at its free end isformed with spur teeth Elli meshing with the teeth of a rack 3| securedto the under side of the carriage ll. During operation of the motor, thegear segment 29 is rocked back and forth and the carriage movedcorrespondingly along the ways 23.

In accordance with one aspect of the present invention, thereciprocatory motion of the carriage I! is utilized directly tooscillate the rolls l l in opposite directions in accurate synchronismwith the back and forth movements of the work tube It. Herein, themotion converting mechanism includes a link 32 (see Fig. 14) pivoted at33 on the forward end of the carriage l i and pivotally connected at 3to one end of a rack bar 35 which is slidable in guides 35 formed on thebase part of the roll frame [2 (Fig. 10). A pinion 31 journaled on theframe 22 meshes with the teeth of the rack 35 and also with'a gear 38fast on the lower roll shaft 2 1. Another gear 38 on the shaft 2! mesheswith a gear 39 on the shaft of the upper roll. As a result, the rollsturn in the 4 tube or allow expansion of the jaws to release the tube.The tube 52 is journaled in bearings 55 at opposite ends of a hole 56extending through a slide 40 concentric with the tube.

A second device 51 (Figs. 1, 8 and 14) is adapted to grip the reducedend portion of the work tube ID beyond the rolls l I and apply a torquefor assisting the gripper IS in turning the tube while permitting thetube to slide endwise therethrough as it is elongated in the rollingoperation. This auxiliary gripper is mounted on a frame 58 and directionindicated by the arrows in Fig. 14 while the carriage ll isadvancing tothe left and in the reverse direction while the carriage is moving inthe opposite direction.

Mounted on the carriage ill and movable relative thereto in guideways 4|formed thereon parallel to the ways 23 is a slide ll] on which the tubegripper I5 is journaled. The ways 4! are long enough to permit movementof the slide through a range somewhat greater than the length of thetubes In to be operated on. The trailing tube end (see Figs. 6 and 20)is received in a ring 42 having angularly spaced inwardly openingrecesses 43 receiving jaws 44 which abut against the tube end. Theconedexternal surfaces of the jaws fit into complemental surfaces 45 ona ring 45. Through thrust washers 41, the latter ring abuts against aninturned flange 48 on a collar 49 screw threaded at 50 onto a nut 5ithreaded onto the end of a tube 52 having spur teeth 53 formed thereon.By applying a spanner wrench to holes 54, the collar 49 may be turnedrelative to the nut 5| and moved axially causing the internally conedring 46 to collapse the jaws 44 around the work includes a slide 60(Fig. 8) guided along ways 59 and connected to the forward end of thecarriage I! by links 6| disposed along opposite sides of the roll frame22.

Extending through and journaled in an elongated bearing 60 in the slide613 is a sleeve 62 held against axial movement by thrust washers B3. Aring 64 surrounding the sleeve 62 and sliding along a key 65 thereon isurged axially by springs 66 which act against a nut E! threaded onto thesleeve to adjust the spring tension.

The outer end of the ring 64 bears against the free ends of angularlyspaced radially disposed arms 68 pivoted at their inner ends on pins 69carried by the sleeve 62. Outward swinging of the arms 58 is limited byadjustable stops F0 on the slide 50. Swingable on pivot pins H on thearms 68 and projecting inwardly therefrom are angularly spaced jaws 12whose inner ends project through holes 13 in the sleeve 62 and bearagainst the exterior of the work tube Hi, the reduced end portion ofwhich extends axially through the sleeve. The pins H are radially spacedoutwardly slightly beyond the pins 69. It will be seen that the jaws 12are always urged into frictional gripping engagement with the tube It bythe action of the springs 55 on the arms 53 and are thus adapted at alltimes to transmit rotary torque to the tube [0. At the same time,however, and by virtue of the relative radial spacing of the pivots 69and ii, the jaws l2 and the arms 68 on which the latter are carried areyieldable outward by rocking of the arms 68 away from the stop i0 andagainst the action of the springs 56. This permits endwise shifting ofthe engaged part of the tube Ii! through the sleeve 62. Such shiftingoccurs during the step by step forward feeding of the tube and also as aresult of the elongation of the tube which accompanies the reducingaction of the rolls H. The forward end portion of the sleeve 62 isfluted as indicated at T5 and spline coupled to a gear 78 journaled inbearings Ti in a part 18 which is bolted to the top of the frame 58beyond the range of reciprocation of the gripper 51.

A turning moment derived from the motor 2 5 is applied periodically tothe grippers l5 and 5! to rotate the tube 10 through part of arevolution, usually about of a revolution, while the surfaces of therolls H are out of engagement with the tube end of each stroke of thecarriage ll. For this purpose, a shaft 19 (Figs. 1, l3 and 14) carryingthe carriage drive gears 25 is connected by bevel gears 80 to ahorizontal shaft 81 journaled on the bed IS. The shaft 8| (Fig. 14) isbevel geared to a shaft 82 carrying a cam 83 which'acts on a follower 84to swing an arm 85 about a pivot 86 a distance determined by the rise ofthe cam. The rocking motion of the arm 85 is imparted to the driving pin8'5 of a ratchet or other type of one-way clutch 81 by which a gear 88is correspondingly turned. Through a suitable gear connection 89 and ashaft t9 mounted on the bed l3 and the frame 58, this motion istransmitted in the proper direction to the gear 76 by which the gripper51 is turned. The cam shaft 82 makes one revolution during each forwardand return stroke of the carriage IT and the cam 83 is shaped to advancethe shaft 90 one step while the rolls I I are out of engagement with thetube I at the end of each carriage stroke.

In a similar way, the motion is applied in the proper direction to ashaft 90 (Figs. 13 and 14) journaled on the bed I3 and spline coupled toa gear 9| meshing with the gear 53 by which the gripper I is driven. Theshaft 90 is extended further along the bed and, at its rear end (Fig.13), is splined into a gear 92 journaled on the bed I3 and meshing withspur teeth on the exterior of a ring 93 (Figs. 11 and 13). The latter isjournaled in bearings 94 on an extension 99 of the carriage I1 and heldagainst axial movement by thrust washers 95. The ring gear is formedwith internal teeth 96 meshing with teeth on the exterior of a drivering 91 slidably keyed at 08 onto the longitudinally grooved rear. endportion Ii; of the mandrel I8.

Means is provided for holding the mandrel solidly against endwisemovement relative to the carriage I'I during the tube reducing operationwhile permitting step by step turning of the mandrel and also endwisewithdrawal of the latter preparatory to inserting a new work tube.Herein, this means includes a spool I00 (Fig. 11) journaled on a sleeveIOI and clamped by a nut I02 between thrust members I03. The sleeve inturn is clamped between nuts I04 threaded onto reduced portions of themandrel.

Projectable into and out of the groove of the spool I00 are plungers I05(Figs. 9 and 11) guided in ways on the carriage extension 59 and shapedat their inner ends to fit closely around the spool. Rack teeth on theouter ends of the plungers mesh with gear segments I06 pivoted at I0'Ion the extension 99. The free ends of the segments are pivotallyconnected at I08 to a link I09 which is joined to a rod II 0 slidablevertically in the extension 99. The rod carries a piston III movable ina stationary cylinder II2. By admitting pressure fluid to the upper andlower ends of the cylinder, thrust sustaining plungers may be moved outof and into the groove of the spool I00 to lock or release the mandrel.When the plungers are withdrawn, the mandrel with the spool and the ring97 thereon may be withdrawn rearwardly through the hollow ring gear 93.V

If desired, such withdrawal may be effected by a power actuator of thetype shown in Figs. 11 and 12 and including a non-circular tube II3surrounding the rear end portion I8 of the mandrel and clamped by a nutII I against the ring 9?. Teeth I 55 formed along the upper side of thetube are adapted to receive between them the tapered end III; of aplunger II'I normally urged into the locking position shown in Fig. 11but withdrawable by energiz'ation of a solenoid H8. The lunger isslidable in an extension II9 on a slide I20 which loosely surrounds andguides the tube H3 and itself is guided in ways I2I on another extensionI22 of the machine bed I3. A lug I23 on the underside of the slide I20is coupled to an endless chain I 24 extending around sprockets I25 oneof which is on a shaft I29 adapted to be turned through a slip clutchconnection I26 with a gear IN. The latter may be rotated by hand or, asshown diagrammatically in Fig. 12, by a reversible electric motoractuator I28.

When the actuator is energized in one direc- 6 tion after release of thethrust plungers I05, the slide I20 with the mandrel I8, the ring 91, andthe 'spool I00 coupled thereto are drawn rearwardly along the bed waysI2'I far enough to The mechanism I '6 above referred to operates to feedthe tube I0 forwardly intermittently in timed relation to thereciprocations of the carriage II and irrespective of the position ofthe slide 40 along the carriage. To operate reliably under the heavyforces involved, this mechanism is of rugged construction and adapted toact positively. It comprises generally screws I30 (Figs. 4 to 7) mountedon the carriage I! and rotating continuously to advance the slide 40 inone direction relative to the carriage and a cam device I3I (Figs. 4 to13) mounted on the slide and rotated continuously to advance the gripperI5 relative to the slide in the opposite direction so as to neutralizethe screw motion during the time that the work is engaged by the rollsII while advancing the gripper I5 to feed the tube when the rolls areout of engagement with the tube at the end of the forward stroke of thecarriage II.

Referring to Figs. 4 to 7 and 15 to 19, the screw I30 is duplicated onopposite sides of the slide 40 and threads through nuts I32 secured inopposite ends of bores I33 through which the screws extend parallel tothe axis of the work tube. The screws are somewhat longer than thelengths of the work tubes I0 and at their rear ends are journaled inbearings I34 (Fig. 19) on the carriage IT and firmly held againstendwise movement by heavy thrust washers I35. Fast on the rear ends ofthe screws are worm wheels I39 meshing with worms I3? (Fig. 13) on acrossshaft I 38 journaled on the carriage and connected throughinterchangeable pick-off gears I39 with a shaft I00. A train of beveland spur gears I4I rotatably mounted on the carriage Il extends from theshaft I40 to a gear I 42 splined on a shaft I43 journaled on the bed I3and connected through a worm and worm wheel I44 to a drive shaft I05.This'shaft maybe driven by an electric rapid return motor I46 or fromthe main motor driven shaft 8i through bevel gears I4? and a one toothclutch I 43 having jaws which interengage in only one angular positionof the drivingand driven parts which may be engaged and disengaged byaxially shifting the clutch collar I49 by any suitable means (notshown).

The screws and their drive'connections are so constructed that in eachstroke at of the carriage I1, the slide will be advanced relative to thecarriage a distance a (Fig. 15). In a complete cycle or during bothforward and return strokes of the carriage, the slide is advanced adistance b (Fig. 16).

In the present instance, the positively acting cam device I3! comprisestwo open face cams I50 (Figs. 4 and 13) disposed on opposite sides ofand acting against rollers l5I on a follower lever I52 fulcrumedintermediate its ends on a in I53 on a casing I54 secured to the top ofthe slide.

- The cams I50 which rotate in planes paralleling the work axis arekeyed to shafts I55 journaled in the casing I54 and carrying gears I56which are joined by bevel gears. I51 to a spline shaft (58. This shaftprojects rearwardly from the slide 45 and at its end is adapted to becoupled by a one tooth clutch I59 to a gear I66 which is driven throughsuitable gearing IGI from the shaft I43. The clutch may be engaged anddisengaged by a hydraulic actuator I62.

The other or inner end of the lever I52 is forked as shown in Figs. 6and '7 to straddle a collar I63 having trunnions I64 thereon projectingthrough holes in thelever. The collar is disposed between thrust washerabutments I65 on a sleeve I66 keyed to but slidable along the sleeve 52above referred to. Heavy coiled springs I61 acting in compressionbetween abutments on the sleeves 52 and IE6 serve asslightly yieldablecushions between the cams and the gripper I actuated thereby.

The cam shafts I55 are timed to make one complete revolution during onecycle of reciprocation of the carriage I'I. At the end of the forwardstroke of the carriage and after the work tube It has been fed forwardlyby the cams I50, the parts will be positioned as shown in Figs. 4 and15, one follower roller l5i engaging the high point of the forward camI50 and the low point of the other cam. -Now, during retraction of thecarriage IT and the work tube to the position shown in Fig. 16, thescrews I30 move the slide progressively and forwardly relative to thecarriage I? a distance a and at the same time the cams I56 turnclockwise through a half revolution rocking the follower lever I52progressively to the perpendicular position shown in Fig. 16 thusretracting the gripper I5 relative to the slide 46 an amount indicatedat b and equal to the distance a, the parts then being positioned asindicated in Fig. 16.

Advance of the slide 49 by the screws continues in the next or forwardstroke of the carriage I"! by a distance e during which thecounterclockwise rocking of the follower lever I52 is continued by thegradual rise of the forward cam I50 and a corresponding fall in the rearcam. The gripper i5 is thus further retracted relative to the slide adistance I equal to the distance e. The parts are then positioned asshown in Fig. 17, the rollers II having passed out of engagement withthe work tube 20. .The sharp rise I'iil (Fig. 4) of the forward cam andthe corresponding fall l'II of the other cam are then presented to thefollower rollers I5I in the final part of the cam revolutions thusshifting the lever I52 quickly in the reverse or clockwise directionfrom the position shown in Fig. 17 to that of Fig. 18. The gripper 55 isthus projected forwardly relative to the slide 49 a distance g, and thework tube is fed forwardly through the rolls II to bring a new length hof the unreduced tube into operative association with the rolls.The-cycle of reciprocation of the carriage is now complete, and theparts are again in the starting position above assumed.

Operation The operation of the machine as above described may besummarized with reference to Figs. 15 to 1'7 assuming that the carriageI1 is fully advanced and the work tube has been fed forwardly as shownin Fig. 15. As the carriage moves backwardly and to the right, the rollsII turn in the direction indicated in Fig. 15 into engagement with thework at the unreduced diameter thereof and, in the continued movement,roll out the metal progressively to the reduced diameter. This resultsin an elongation of the leading end portion of the tube beyond the rollswhich is permitted by the one way action of the gripper 5? as describedabove.

At the end of the backward stroke of the carriage, the rolls will havepassed out of engagement with the tube as shown in Fig. 16. Thereupon,the cam 83 acts through the one way clutch 81' to turn the shaft throughone step and thereby apply to both of the tube grippers I5 and 5'! andto the mandrel I8 a torque for turning the same usually through aboutone seventh of a revolution.

Now, as the carriage I1 and the work tube are pushed in the next stroke,the rolls II are turned reversely as indicated in Fig. 16 and engage thetapered portion of the tube progressively to further roll out the metalof the tapered part of the tube. As the carriage reaches its forwardlimit of travel (Fig. 17), the rolls pass out of engagement with thetube and the cam 63 again operates to turn the tube grippers I5 and 5'!and the mandrel I8. At the same time, the cams I59 operate as describedabove to feed the gripper I5 and the tube forwardly through the distanceg (Fig. 18) thus presenting a new length of the tube to the rolls andcompleting the machine cycle.

Successive cycles are repeated until the trail ing end of the tube hasreached a predetermined position at which the machine is stoppedpreparatory to inserting a new tube. To accomplish this, the gripper I5is released manually, both of the one tooth clutches 849 and I59 aredisengaged, and the motor I26 is started in a direction to retract themandrel IS out of the tube it a distance somewhat greater than thelength of the new tube to be inserted. Next, the rapid traverse motorI46 is started in a direction to cause the screws I36] to retract theslide 46 and the gripper I5 relative to the carriage IT a distancesufficient to enable the new tube to be inserted in the latter which isthen tightened. The motor I46 may be operated reversely until theleading end of the new tube comes into abutment with the end of thepartially reduced tube.

By operating the motor I28 reversely, the mandrel I8 is next movedaxially through the new tube and until a stop I30 (Fig. 11) on the ring9? moves with the mandrel slide I I3 and encounters the end of the gear93. The tapered end of the mandrelwill then be positioned accurately inthe proper position between the rolls II.

After reengagement of the clutches I49 and IE9, the machine may berestarted. 1n the ensuing cycles of the machine, the leading tube isurged backwardly by the action of the rolls I I and thus is always heldin proper abutment with the leading end of the new tube.

I claim as my invention:

1. In a bar reducing machine, the combination of, a stationary frame, acarriage guided for reciprocation on said frame, means on said carriagefor fastening one end portion of a work bar thereto for movement backand forth with the carriage, forging rolls journaled on said stationaryframe to receive the other end portion of the supported bar, poweroperated means for reciprocating said carriage back and forth, a rackbar connected to said carriage and projecting past said rolls, gearinginterconnecting said rolls and the teeth of said rack bar and operableto osoil-late said rolls in opposite directions and back and forthduring reciprocationof said carriage, mechanism mounted on said carriagefor movement therewith for holding the work bar positively againstendwise movement and operable when actuated to positively feed the workbar forwardly relative to the carriage, and means connecting said poweroperated means and said mechanism and operable while said carriage isdisposed near the endof its forward stroke to transmit a positivelymeasuredincrement of movement of said power operated means to said feedmechanism.

2. In abar reducing machine, the combination of, a stationary frame, acarriage guided for reciprocation on said frame, means on said carriagefor fastening one end portion of a work bar thereto for movement backand forth with the carriage, forging rolis journal'ed on said stationaryframe to receive the other end portion of the supported bar, a powerrotated drive shaft, means driven by said shaft to reciprocate saidcarriage back and forth, a rack. connected to said carriage andreciprocating'therewith, gearing on said frame interconnecting saidrolls and the teeth of said rack and operable to oscillate said. rollsin opposite directions and back and forth during reciprocation of saidcarriage, mechanism including a rotary member mounted on said carriageand operable by its rotation to feed the work bar forwardly relative tothe carriage, a shaft spline coupled to said rotary member and extendingalong said carriage, and means driven from said drive shaft and operableto turn the spline shaft one step while said carriage is disposed ateach end of its range of reciprocation.

3, In a bar reducing machine, the combination of, a stationary frame, acarriage guided for reciprocation on said frame, a gripper rotatablymounted on said carriage for fastening one end portion of a work barthereto for movement back and forth with the carriage, forging rollsjournaled on said stationary frame to receive the other end portion ofthe supported bar, a power rotated drive shaft, means operated therebyto reciprocate said carriage back and forth, gearing interconnectingsaid rolls and said carriage and operable to oscillate said rolls inopposite directions and back and forth during reciprocation of saidcarriage, mechanism mounted on said carriage and operable to feed saidgripper forwardly relative to the carriage while the latter is disposedat the end of its forward. stroke, a second gripper movable with saidcarriage and engageable with the reduced end portion of the work barbeyond said rolls, said second gripper having jaws movable to' permit ofendwise elongation of said bar by said rolls, and means driven by saiddrive shaft and actuated intermittently and at the end of a stroke ofsaid carriage to turn both of said grippers.

i. In a bar reducing machine, the combination of, a stationary frame, acarriage reciprocable back and forth in ways supported by said frame, aslide mounted on said carriage for reciprocation relative theretoparallel to said ways, a gripper for clamping the trailing end of a workbar and mounted on said slide for movement relative thereto parallel tosaid ways, metal working rolls journaled on said frame to receive andoperate on the forward end portion of a bar clamped in said gripper, apower rotated drive shaft, means driven from said shaft forreciprocating said carriage, means for converting the reciprocatorymotion of said carriage into oscillatory motion of said rolls, a screwthreading into said slide along the path of reciprocation thereof andretatably mounted on said carriage, means driven from said shaft andturning said screw con-tinuously to advance said slide relative-to saidcarriage, a lever fulcrumed on said slide andconnected to said gripperto shift the same back and forth parallel tosaid ways, and cam mechanismrotated in synchronism with said screw and operable through said leverto positively retract the gripper relative to said slide duringthereturn and forward strokes of said carriage and advance the gripperwhile the carriage is at the end of its forward stroke, the rate ofretraction of said gripper by said cam mechanism being equal to the rateof advance of said slide by said screw;

5'. In a bar reducing machine; the combination of, a stationary frame, acarriage reciprocable back and forth in ways supported by said frame,

a slide mounted on said carriage for reciprocation relative theretoparallel to said ways and through a range greater than the length of. awork bar to be reduced, a gripper for clamping the trailing end of awork bar and: mounted on said slide for movement relative theretoparallel ;to said ways, metal working rolls j'ournaled on said frame toreceive and operate on the forward end portion of a bar clamped in saidgripper, a power rotated drive shaft, means driven from said shaft forreciprocating said carriage, means for convertingthe reciprocatorymotionof said carriage into oscillatory motion of said rolls, a screwthreading into said slide along the path of reciprocation thereof androtatably mounted on said carriage, means driven from said shaft andturning said screw continuously to advance said slide relative to saidcarriage, a rotary cam mechanism mounted on said slide and drivencontinuously from said drive shaft, and a follower positively actuatedby said cam mechanism operable to advance and retract said gripperrelative to the slide, said cam mechanism being shaped to retract saidgripper progressively relative to the slide during the retraction andadvance of said carriage at the rate of advance of said slide by saidscrew and at the end of the carriage advance to feed said gripperforwardly relative to the slide.

6. In a bar reducing machine, the combination of, a stationary frame, acarriage reciprocable back and forth in ways supported by said frame, aslide mounted on said carriage for reciprocation relative theretoparallel to said ways, a gripper for clamping the trailing end of a workbar and mounted on said slide for movement relative thereto parallel tosaid ways, metal working rolls journaled on said frame to receive andoperate on the forward end portion of a bar clamped in said gripper, apower rotated drive shaft, means driven from said shaft forreciprocating said carriage, means for converting the reciprocatorymotion of said carriage into oscillatory motion of said rolls, meansdriven from said shaft and operable continuously to advance said sliderelative to said carriage, and a rotary cam mechanism drivencontinuously from said drive shaft and operable to retract said gripperprogressively relative to the slide during the rectraction and advanceof said carriage and, at the end of the carriage advance, to feed saidgripper forwardly relative to the slide, the rate of retraction of saidgripper by said cam mechanism being equal to the rate of advance of saidslide by said last mentioned means.

7. In a bar reducing machine, the combina- 11 tion of, a stationaryframe, a carriage reciprocable back and forth in ways supported by saidframe, a slide mounted on said carriage for reciprocation relativethereto parallel to said ways and through a range greater than thelength of a work bar to be reduced, a gripper for clamping the trailingend of a work bar and mounted on said slide for movement relativethereto parallel to said ways, metal working rolls journaled on saidframe to receive and operate on the forward end portion of a bar clampedin said gripper, a

power rotated drive shaft, means driven from said shaft forreciprocating said carriage, means for converting the reciprocatorymotion of said carriageinto oscillatory motion of said rolls, screw andnut elements mounted on said carriage and continuously driven from saidshaft to advance said slide relative to said carriage, and cam andfollower elements on said carriage driven continuously from said driveshaft and operable to advance and retract said gripper relative to saidcarriage during the retraction and advance thereof and at the end of thecarriage advance to feed said gripper forwardly relative to thecarriage, the rate of advance of said gripper being equal to the rate ofadvance of said slide by said screw.

8. In a bar reducing machine, the combination of, a stationary frame, acarriage guided for reciprocation on said frame, means on said carriagefor fastening one end portion of a work bar thereto for movement backand forth with the carriage, forging rolls journaled on said stationaryframe to receive and work the other end portion of the supported bar, apower driven shaft, means driven by said shaft to reciprocate saidcarriage back and forth and also oscillate said rolls in oppositedirections back and forth during reciprocation of the carriage,mechanism mounted on said carriage for movement therewith for feedingthe work bar forwardly relative to the carriage near the end of eachforward stroke of the latter, said mechanism including a slide mountedon said carriage and advanced continuously relative to the carriageduring operation of the rolls on successive longitudinal sections gt thework bar, said mechanism also including a member mounted on said slideand rotatable continuously during advance of the slide, and a rotarydrive connection extending to said rotary member and having rotary partsdisengageable from each other to permit return of said slide withoutrotation of said member, said parts being interengageable with eachother in one angular position only.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 822,878 Briede June 5, 1906 2,301,094 Tiedmann Nov. 3, 19422,560,934 Coe July 1'7, 1951 FOREIGN PATENTS Number Country Date 7,185Great Britain Mar. 24, 1906 149,862 Austria June 10, 1937 521,611Germany Mar. 27, 1931

